GENERAL TOOLS 3/8" Hollow Steel Punch is made of forged steel with a side clearance hole for easy removal of punched material. It is used for punching holes in leather, rubber, canvas, cardboard, plastic and other materials. The GENERAL TOOLS Hollow Steel Punch is the ideal tool for punching a 3/8 inch hole. It works on leather, rubber, canvas, plastic, sheet metal, gasket material, cardboard and softer metals and features a side clearance hole for easy removal of punched material. This punch is made of heat-treated forged steel, ensuring durability and a cutting edge that stays sharper longer.